Need help about portal server

hi,
i'm new to java. and i installed java enterprise server on windows xp. the installation was successful ..but i can't login to portal server using the admin console username/password ? ....how do i set the password for the portal server ? ....and how can i login ? ...i enabled the portal in the admin console but still i;m getting some error ...when i tried to access the portal using this address
http://localhost:8080/portal/dt
error =>
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
java.lang.NullPointerException
java.util.Hashtable.put(Hashtable.java:396)
java.util.Properties.setProperty(Properties.java:128)
com.sun.portal.desktop.monitoring.MonitoringSubsystemWrapper.initMonitoringSubs ystem(MonitoringSubsystemWrapper.java:96)
com.sun.portal.desktop.monitoring.MonitoringSubsystemWrapper.getDesktopMonitori ngSubsystem(MonitoringSubsystemWrapper.java:168)
com.sun.portal.desktop.DesktopServlet.service(DesktopServlet.java:426)
javax.servlet.http.HttpServlet.service(HttpServlet.java:860)
sun.reflect.GeneratedMethodAccessor89.invoke(Unknown Source)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:25)
java.lang.reflect.Method.invoke(Method.java:585)
org.apache.catalina.security.SecurityUtil$1.run(SecurityUtil.java:249)
java.security.AccessController.doPrivileged(Native Method)
javax.security.auth.Subject.doAsPrivileged(Subject.java:517)
org.apache.catalina.security.SecurityUtil.execute(SecurityUtil.java:282)
org.apache.catalina.security.SecurityUtil.doAsPrivilege(SecurityUtil.java:165)
note The full stack trace of the root cause is available in the Sun-Java-System/Application-Server logs.
===============================================
please help me in this . thanks in advance..... :-)
what is this amconsole ? .....and ampassword ?

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872882 wrote:
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